Homework Help:
Mass Spectrometer question

1. The problem statement, all variables and given/known data
A mass spectrometer is designed to separate protein fragments. The fragments are ionized by removing a single electron and then enter a 0.80 T uniform magnetic field at a speed of 2.3*10^5 m/s
If a fragment has a mass that is 85 times the mass of the proton, what will be the distance between the points where the ion enters and exits the magnetic field?

2. Relevant equations

3. The attempt at a solution I used m=(qBr)/V also tried r= (2mv/2qB^2)^.5

and then multipid r *2 to get d? Nothing is working. The value m I'm using is 1.4*10^-25, B=.8, q=1.6*10^-19, v=2.3*10^-5?????